Index/Match Issue

Hi

Hope you can help..!

I have 3 columns:

A = Chassis Type
B = Body Type
C = Free Space

I have created a drop down menu for the user to select a chassis and body type, and based on those 2 selections I would like to return the Free Space value.

I am trying to create a index/match formula but am really struggling!!

Any assistance would be greatly appreciated.

Regards

Lee